US20120326801A1 - Duplexer - Google Patents
Duplexer Download PDFInfo
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- US20120326801A1 US20120326801A1 US13/551,853 US201213551853A US2012326801A1 US 20120326801 A1 US20120326801 A1 US 20120326801A1 US 201213551853 A US201213551853 A US 201213551853A US 2012326801 A1 US2012326801 A1 US 2012326801A1
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- United States
- Prior art keywords
- columnar conductor
- substrate
- drawn part
- electrically connected
- ground pattern
- Prior art date
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders; Supports
- H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
- H03H9/0566—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers
- H03H9/0576—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers including surface acoustic wave [SAW] devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/72—Networks using surface acoustic waves
- H03H9/725—Duplexers
Definitions
- the present invention relates to a duplexer used in a mobile phone and the like.
- this kind of duplexer includes an acoustic wave element 1 having an antenna terminal 1 A, a reception terminal 1 B, and a transmission terminal (not shown), and a ceramic substrate 2 on which the acoustic wave element 1 is set.
- the substrate 2 internally has a columnar conductor 2 A electrically connected to the antenna terminal 1 A and drawn to a back surface of the substrate 2 , a columnar conductor 2 B electrically connected to the reception terminal 1 B and drawn to the back surface of the substrate 2 , and a columnar conductor (not shown) electrically connected to the transmission terminal (not shown) and drawn to the back surface of the substrate 2 .
- Japanese Patent Laid-open Publication No. 2000-49565 is known as a conventional art document information relating to this application.
- the above-described duplexer has had a problem in low isolation.
- the present invention provides a configuration having a first ground pattern region arranged between a first columnar conductor drawn part and a second columnar conductor drawn part on a back surface of a substrate, a second ground pattern region electrically connected to the first ground pattern region on the back surface of the substrate, and arranged in a part not including between the first columnar conductor drawn part and the second columnar conductor drawn part, a third columnar conductor electrically connected to the first ground pattern region, while being buried partially in the substrate, and an insulating coating formed on a surface to which the first ground pattern region is exposed.
- the insulation coating prevents a short circuit from generating between the first columnar conductor drawn part and the second columnar conductor drawn part, and the third columnar conductor electrically connected to the second ground pattern region through the first ground pattern region prevents electromagnetic field coupling from generating between the first columnar conductor and the second columnar conductor, and as a result, isolation of the duplexer can be improved.
- FIG. 1 is a top view of an acoustic wave element in a duplexer according to a first embodiment of the present invention
- FIG. 2 is a cross-sectional view of the duplexer according to the first embodiment of the present invention.
- FIG. 3 is a cross-sectional view taken along a line B-BB in FIG. 2 ;
- FIG. 4 is a cross-sectional view taken along a line C-CC in FIG. 2 ;
- FIG. 5 is a cross-sectional view taken along a line D-DD in FIG. 2 ;
- FIG. 6 is a bottom view of the duplexer according to the first embodiment of the present invention.
- FIG. 7 is a cross-sectional view taken along a line E-EE in FIG. 2 ;
- FIG. 8 is a cross-sectional view taken along a line C-CC in FIG. 2 ;
- FIG. 9 is a cross-sectional view taken along a line B-BB in FIG. 2 ;
- FIG. 10 is a bottom view of the duplexer according to the first embodiment of the present invention.
- FIG. 11 is a bottom view of the acoustic wave element of the duplexer according to the first embodiment of the present invention.
- FIG. 12 is a cross-sectional view showing another embodiment of the duplexer according to the first embodiment of the present invention.
- FIG. 13 is a frequency property diagram of the duplexer according to the first embodiment of the present invention.
- FIG. 14 is a cross-sectional view of a conventional duplexer.
- the duplexer according to this embodiment includes an acoustic wave element 4 having an antenna terminal 4 A serving as a first terminal, reception terminals 4 B and 4 D serving as second terminals, and a transmission terminal 4 C on its lower side and as shown in FIG. 2 , a substrate 5 on which the acoustic wave element 4 is set.
- the duplexer according to this first embodiment outputs reception signals as a balanced output with the reception terminals 4 B and 4 D.
- FIG. 2 is a cross-sectional view showing the whole duplexer taken along a line A-AA in FIG. 1 .
- the substrate 5 internally has a first columnar (pillar or via) conductor 5 A having at least one embedded part therein, electrically connected to the antenna terminal 4 A, and drawn to a back surface of the substrate 5 , and a second columnar conductor 5 B and a fifth columnar conductor 5 E electrically connected to the reception terminals 4 B and 4 D respectively, while each being partially buried in the substrate 5 , and drawn to the back surface of the substrate 5 similarly.
- a cross sectional view taken along a line B-BB in FIG. 2 is shown in FIG. 3
- a cross section taken along a line A-AA in FIG. 3 corresponds to FIG. 2 .
- the back surface of the substrate 5 includes a first ground pattern region 8 A arranged in a region sandwiched by two dotted lines which are parallel to a straight line connecting the drawn part of the first columnar conductor 5 A and the drawn part of the second columnar conductor 5 B, and a second ground pattern region 8 B electrically connected to the first ground pattern region 8 A, and arranged in the region not including the region sandwiched by the above two dotted lines between the drawn part of the first columnar conductor 5 A and the drawn part of the second columnar conductor 5 B.
- a third columnar conductor 5 C is formed so as to be electrically connected to the first ground pattern region 8 A as shown in FIG. 4 , and embedded in the substrate 5 as shown in FIG. 2 .
- the third columnar conductor 5 C is at roughly the ground potential.
- an insulation coating 7 is provided on a surface to which the first ground pattern region 8 A is exposed as shown in FIG. 5 as a sectional view taken along a line D-DD in FIG. 2 .
- a first columnar conductor drawn part 6 A, a second columnar conductor drawn part 6 B, and the second ground pattern region 8 B are exposed from parts 7 A, 7 B, and 7 C, respectively, in which the insulating coating is not provided, as shown in FIG. 6 as a bottom view of the duplexer shown in FIG. 2 .
- a fifth columnar conductor drawn part 6 E electrically connected to the reception terminal 4 D through the fifth columnar conductor 5 E is also exposed.
- the duplexer outputs the reception signals as a balanced output with the second columnar conductor drawn part 6 B and the fifth columnar conductor drawn part 6 E.
- FIG. 6 is a bottom view, it is a mirror-reversed view of FIG. 5 as the cross-sectional view taken from the top of the duplexer.
- the transmission terminal 4 C shown in FIG. 1 is electrically connected to a columnar conductor 5 D shown in FIG. 3 , in the substrate 5 shown in FIG. 2 , and as shown in FIG. 6 , its drawn part 6 D is exposed from the part in which the insulation coating 7 is not formed in the back surface of the substrate 5 .
- the insulation coating 7 prevents a short circuit from generating between the first columnar conductor drawn part 6 A and the second columnar conductor drawn part 6 B
- the third columnar conductor 5 C electrically connected to the second ground pattern region 8 B through the first ground pattern region 8 A prevents electromagnetic field coupling from generating between the first columnar conductor 5 A and the second columnar conductor 5 B.
- the isolation of the duplexer can be improved.
- the third columnar conductor 5 C electrically connected to the first ground pattern region 8 A prevents the electromagnetic field coupling from generating between the first columnar conductor 5 A and the second columnar conductor 5 B, and as a result, the balance properties of the reception signals outputted from the columnar conductor drawn parts 6 B and 6 E can be improved. Thus, attenuation properties in a transmission band can be improved.
- the balance properties of the reception signals outputted from the columnar conductor drawn parts 6 B and 6 E can be also improved.
- the attenuation properties in the transmission band can be improved.
- the balance properties of the reception signals outputted from the columnar conductor drawn parts 6 B and 6 E can be further improved ( FIG. 4 ).
- the attenuation properties in the transmission band can be further improved.
- the first ground pattern region 8 A and the fourth ground pattern region 8 C are partially overlapped.
- the balance properties of the reception signals outputted from the columnar conductor drawn parts 6 B and 6 E can be improved.
- the attenuation properties in the transmission band can be further improved.
- the antenna terminal 4 A and the reception terminal 4 B are electrically connected to the first and second columnar conductors 5 A and 5 B, respectively through solder bumps 8 , columnar conductors 9 A and 9 B and an electrode pattern 10 shown in FIG. 7 as a cross-sectional view taken along a line E-EE in FIG. 2 .
- the electrode pattern 10 is interposed in the substrate 5 , the positions of the first columnar conductor drawn part 6 A and the second columnar conductor drawn part 6 B are not limited to the positions of the antenna terminal 4 A and the transmission terminal 4 B in the acoustic wave element, so that a degree of design freedom is enhanced.
- the third columnar conductor 5 C is electrically connected to a shortest line segment 16 connecting the first columnar conductor drawn part 6 A and the second columnar conductor drawn part 6 B in the first ground pattern region 8 A.
- the electromagnetic field coupling can be more effectively prevented from generating between the first columnar conductor drawn part 6 A and the second columnar conductor drawn part 6 B, and as a result, the isolation of the duplexer can be efficiently improved.
- the third columnar conductor 5 C is arranged in a plane 9 containing the first columnar conductor 5 A and the second columnar conductor 5 B because the electromagnetic field coupling can be more effectively prevented from generating between the first columnar conductor 5 A and the second columnar conductor 5 B, and as a result, the isolation of the duplexer can be improved.
- this configuration can improve the balance properties of the reception signals outputted from the columnar conductor drawn parts 6 B and 6 E. As a result, the attenuation properties in the transmission band can be improved.
- the duplexer has a function to output a balanced signal, that is, in a case where the reception terminal 4 B shown in FIG. 2 is a first balanced output terminal, the acoustic wave element has a second balanced output terminal (not shown) as a third terminal, and a fourth columnar conductor (not shown) having at least one part embedded in the substrate 5 , electrically connected to the second balanced output terminal (not shown), and drawn to the back surface of the substrate 5 is provided.
- both of the second columnar conductor drawn part 6 B and the fourth columnar conductor drawn part (not shown) are exposed onto the back surface of the substrate 5 having a limited area, either one of the second columnar conductor drawn part 6 B and the fourth columnar conductor drawn part (not shown) is inevitably close to the first columnar conductor drawn part 6 A shown in FIG. 6 , so that there is concern that the isolation could be lowered. In this case, as shown in FIG.
- the third columnar conductor 5 C electrically connected to the second ground pattern region 8 B through the first ground pattern region 8 A can prevent the electromagnetic field coupling from generating between the first columnar conductor 5 A and the second columnar conductor 5 B, and as a result, the isolation of the duplexer can be improved.
- a desirable effect can be produced when the drawn parts (not shown) of them on the back surface of the substrate 5 are arranged on the same one side in the back surface of the substrate 5 because a connection wiring with another component can be facilitated on a module substrate (not shown) mounting this duplexer.
- the first columnar conductor drawn part 6 A electrically connected to the antenna terminal 4 A (refer to FIGS. 1 and 2 ) is arranged in the center of a first side 10 A.
- the drawn part 6 B of the second columnar conductor 5 B electrically connected to the reception terminal 4 B (refer to FIGS. 1 and 2 ) is arranged on a second side 10 B roughly perpendicular to the first side 10 A in the substrate 5 .
- the drawn part 6 D of the fourth columnar conductor (not shown) electrically connected to the transmission terminal 4 C (refer to FIG. 1 ) is arranged on a third side 10 D roughly perpendicular to the first side 10 A in the substrate 5 .
- the electromagnetic field coupling can be prevented from generating between the antenna terminal 4 A (refer to FIGS. 1 and 2 ) and the reception terminal 4 B (refer to FIGS. 1 and 2 ), and between the antenna terminal 4 A (refer to FIGS. 1 and 2 ) and the transmission terminal 4 C (refer to FIG. 1 ) and the isolation of the duplexer can be improved.
- FIG. 11 as a bottom view of the acoustic wave element 4
- the acoustic wave element includes a DMS (double-mode surface acoustic wave) filter 11
- FIG. 12 it is preferable that a third ground pattern 12 is formed in the substrate 5
- fifth columnar conductors 13 A and 13 B electrically connected to fourth ground patterns 14 A and 14 B of the DMS filter 11 shown in FIG. 11 are electrically connected to the third ground pattern 12 .
- a duplexer according to the present invention produces an effect that isolation can be improved, and can be useful in various electronic devices such as a mobile phone and the like.
Abstract
Description
- The present application claims the priority of Japanese Patent Application No. 2007-257302 filed on Oct. 1, 2007 in Japan and Japanese Patent Application No. 2008-113564 filed on Apr. 24, 2008 in Japan, and the contents of which are incorporated herein by references.
- The present invention relates to a duplexer used in a mobile phone and the like.
- As shown in
FIG. 14 , conventionally, this kind of duplexer includes an acoustic wave element 1 having anantenna terminal 1A, areception terminal 1B, and a transmission terminal (not shown), and aceramic substrate 2 on which the acoustic wave element 1 is set. Thesubstrate 2 internally has acolumnar conductor 2A electrically connected to theantenna terminal 1A and drawn to a back surface of thesubstrate 2, acolumnar conductor 2B electrically connected to thereception terminal 1B and drawn to the back surface of thesubstrate 2, and a columnar conductor (not shown) electrically connected to the transmission terminal (not shown) and drawn to the back surface of thesubstrate 2. Since a ground pattern is not provided between the drawn part of thecolumnar conductor 2A and the drawn part of thecolumnar conductor 2B on the back surface of thesubstrate 2, a solder and the like prevents a short circuit from generating between the drawn part of thecolumnar conductor 2A and the drawn part of thecolumnar conductor 2B. - In addition, Japanese Patent Laid-open Publication No. 2000-49565 is known as a conventional art document information relating to this application.
- The above-described duplexer has had a problem in low isolation.
- More specifically, in the above conventional configuration, when electromagnetic field coupling is generated between the drawn part of the
columnar conductor 2A and the drawn part of thecolumnar conductor 2B, for example, a signal is transmitted from thecolumnar conductor 2A to thecolumnar conductor 2B due to the electromagnetic field coupling, and as a result, its isolation becomes problematically low. - Thus, it is an object of the present invention to improve isolation of a duplexer.
- Thus, in order to achieve the above object, the present invention provides a configuration having a first ground pattern region arranged between a first columnar conductor drawn part and a second columnar conductor drawn part on a back surface of a substrate, a second ground pattern region electrically connected to the first ground pattern region on the back surface of the substrate, and arranged in a part not including between the first columnar conductor drawn part and the second columnar conductor drawn part, a third columnar conductor electrically connected to the first ground pattern region, while being buried partially in the substrate, and an insulating coating formed on a surface to which the first ground pattern region is exposed.
- In the above configuration, the insulation coating prevents a short circuit from generating between the first columnar conductor drawn part and the second columnar conductor drawn part, and the third columnar conductor electrically connected to the second ground pattern region through the first ground pattern region prevents electromagnetic field coupling from generating between the first columnar conductor and the second columnar conductor, and as a result, isolation of the duplexer can be improved.
- The present invention will become readily understood from the following description of preferred embodiments thereof made with reference to the accompanying drawings, in which like parts are designated by like reference numeral and in which:
-
FIG. 1 is a top view of an acoustic wave element in a duplexer according to a first embodiment of the present invention; -
FIG. 2 is a cross-sectional view of the duplexer according to the first embodiment of the present invention; -
FIG. 3 is a cross-sectional view taken along a line B-BB inFIG. 2 ; -
FIG. 4 is a cross-sectional view taken along a line C-CC inFIG. 2 ; -
FIG. 5 is a cross-sectional view taken along a line D-DD inFIG. 2 ; -
FIG. 6 is a bottom view of the duplexer according to the first embodiment of the present invention; -
FIG. 7 is a cross-sectional view taken along a line E-EE inFIG. 2 ; -
FIG. 8 is a cross-sectional view taken along a line C-CC inFIG. 2 ; -
FIG. 9 is a cross-sectional view taken along a line B-BB inFIG. 2 ; -
FIG. 10 is a bottom view of the duplexer according to the first embodiment of the present invention; -
FIG. 11 is a bottom view of the acoustic wave element of the duplexer according to the first embodiment of the present invention; -
FIG. 12 is a cross-sectional view showing another embodiment of the duplexer according to the first embodiment of the present invention; -
FIG. 13 is a frequency property diagram of the duplexer according to the first embodiment of the present invention; and -
FIG. 14 is a cross-sectional view of a conventional duplexer. -
- 4 ACOUSTIC WAVE ELEMENT
- 4A FIRST TERMINAL (ANTENNA TERMINAL)
- 4B SECOND TERMINAL (RECEPTION TERMINAL)
- 5 SUBSTRATE
- 5A FIRST COLUMNAR CONDUCTOR
- 5B SECOND COLUMNAR CONDUCTOR
- 5C THIRD COLUMNAR CONDUCTOR
- 6A FIRST COLUMNAR CONDUCTOR DRAWN PART
- 6B SECOND COLUMNAR CONDUCTOR DRAWN PART
- 7 INSULATING COATING
- 8A FIRST GROUND PATTERN REGION
- 8B SECOND GROUND PATTERN REGION
- Hereinafter, a duplexer according to a first embodiment of the present invention will be described with reference to the drawings.
- As shown in
FIG. 1 , the duplexer according to this embodiment includes anacoustic wave element 4 having anantenna terminal 4A serving as a first terminal,reception terminals transmission terminal 4C on its lower side and as shown inFIG. 2 , asubstrate 5 on which theacoustic wave element 4 is set. In addition, the duplexer according to this first embodiment outputs reception signals as a balanced output with thereception terminals FIG. 2 is a cross-sectional view showing the whole duplexer taken along a line A-AA inFIG. 1 . - Thus, the
substrate 5 internally has a first columnar (pillar or via)conductor 5A having at least one embedded part therein, electrically connected to theantenna terminal 4A, and drawn to a back surface of thesubstrate 5, and a secondcolumnar conductor 5B and a fifthcolumnar conductor 5E electrically connected to thereception terminals substrate 5, and drawn to the back surface of thesubstrate 5 similarly. A cross sectional view taken along a line B-BB inFIG. 2 is shown inFIG. 3 , and a cross section taken along a line A-AA inFIG. 3 corresponds toFIG. 2 . - Thus, as shown in
FIG. 4 as a cross-sectional view taken along a line C-CC inFIG. 2 , the back surface of thesubstrate 5 includes a firstground pattern region 8A arranged in a region sandwiched by two dotted lines which are parallel to a straight line connecting the drawn part of thefirst columnar conductor 5A and the drawn part of the secondcolumnar conductor 5B, and a secondground pattern region 8B electrically connected to the firstground pattern region 8A, and arranged in the region not including the region sandwiched by the above two dotted lines between the drawn part of the firstcolumnar conductor 5A and the drawn part of the secondcolumnar conductor 5B. - Thus, a third
columnar conductor 5C is formed so as to be electrically connected to the firstground pattern region 8A as shown inFIG. 4 , and embedded in thesubstrate 5 as shown inFIG. 2 . In this configuration, the thirdcolumnar conductor 5C is at roughly the ground potential. - Thus, an
insulation coating 7 is provided on a surface to which the firstground pattern region 8A is exposed as shown inFIG. 5 as a sectional view taken along a line D-DD inFIG. 2 . A first columnar conductor drawnpart 6A, a second columnar conductor drawnpart 6B, and the secondground pattern region 8B are exposed fromparts FIG. 6 as a bottom view of the duplexer shown inFIG. 2 . In addition, a fifth columnar conductor drawnpart 6E electrically connected to thereception terminal 4D through the fifthcolumnar conductor 5E is also exposed. In other words, the duplexer outputs the reception signals as a balanced output with the second columnar conductor drawnpart 6B and the fifth columnar conductor drawnpart 6E. - In addition, since
FIG. 6 is a bottom view, it is a mirror-reversed view ofFIG. 5 as the cross-sectional view taken from the top of the duplexer. - In addition, the
transmission terminal 4C shown inFIG. 1 is electrically connected to acolumnar conductor 5D shown inFIG. 3 , in thesubstrate 5 shown inFIG. 2 , and as shown inFIG. 6 , its drawnpart 6D is exposed from the part in which theinsulation coating 7 is not formed in the back surface of thesubstrate 5. - Thus, as shown in
FIG. 6 , theinsulation coating 7 prevents a short circuit from generating between the first columnar conductor drawnpart 6A and the second columnar conductor drawnpart 6B, and as shown inFIG. 4 , the thirdcolumnar conductor 5C electrically connected to the secondground pattern region 8B through the firstground pattern region 8A prevents electromagnetic field coupling from generating between the firstcolumnar conductor 5A and thesecond columnar conductor 5B. As a result, the isolation of the duplexer can be improved. - More specifically, when the second columnar conductor drawn
part 6B and the fifth columnar conductor drawnpart 6E which output the reception signal as the balanced outputs are different in distance to the first columnar conductor drawnpart 6A electrically connected to theantenna terminal 4A, a coupling degree between the second columnar conductor drawnpart 6B and the first columnar conductor drawnpart 6A is different from a coupling degree between the fifth columnar conductor drawnpart 6E and the first columnar conductor drawnpart 6A, so that the balance properties of the reception signals outputted from the columnar conductor drawnparts - Thus, the third
columnar conductor 5C electrically connected to the firstground pattern region 8A prevents the electromagnetic field coupling from generating between the firstcolumnar conductor 5A and the secondcolumnar conductor 5B, and as a result, the balance properties of the reception signals outputted from the columnar conductor drawnparts - In addition, by setting a density of the columnar conductor electrically connected to the first
ground pattern region 8A higher than a density of the columnar conductor electrically connected to the second ground pattern region, the balance properties of the reception signals outputted from the columnar conductor drawnparts - Moreover, by setting the density of the columnar conductor electrically connected to the first
ground pattern region 8A higher than a density of a columnar conductor electrically connected to a fourthground pattern region 8C arranged in a region sandwiched by two thick lines which are parallel to the straight line connecting between the drawn part of thefirst columnar conductor 5A and the fifthcolumnar conductor 5E on the back surface of the substrate, the balance properties of the reception signals outputted from the columnar conductor drawnparts FIG. 4 ) can be further improved (FIG. 4 ). Thus, the attenuation properties in the transmission band can be further improved. In addition, as shown inFIG. 4 , the firstground pattern region 8A and the fourthground pattern region 8C are partially overlapped. - Still furthermore, by setting the number of the columnar conductors electrically connected to the first
ground pattern region 8A greater than the number of the columnar conductors electrically connected to the fourthground pattern region 8C, the balance properties of the reception signals outputted from the columnar conductor drawnparts - In addition, according to this embodiment, as shown in
FIG. 2 , theantenna terminal 4A and thereception terminal 4B are electrically connected to the first and secondcolumnar conductors solder bumps 8,columnar conductors electrode pattern 10 shown inFIG. 7 as a cross-sectional view taken along a line E-EE inFIG. 2 . Thus, when theelectrode pattern 10 is interposed in thesubstrate 5, the positions of the first columnar conductor drawnpart 6A and the second columnar conductor drawnpart 6B are not limited to the positions of theantenna terminal 4A and thetransmission terminal 4B in the acoustic wave element, so that a degree of design freedom is enhanced. - In addition, according to this embodiment, as shown in
FIG. 8 , the thirdcolumnar conductor 5C is electrically connected to ashortest line segment 16 connecting the first columnar conductor drawnpart 6A and the second columnar conductor drawnpart 6B in the firstground pattern region 8A. In this configuration, the electromagnetic field coupling can be more effectively prevented from generating between the first columnar conductor drawnpart 6A and the second columnar conductor drawnpart 6B, and as a result, the isolation of the duplexer can be efficiently improved. - Furthermore, as shown in
FIG. 9 , it is desirable that the thirdcolumnar conductor 5C is arranged in aplane 9 containing thefirst columnar conductor 5A and the secondcolumnar conductor 5B because the electromagnetic field coupling can be more effectively prevented from generating between thefirst columnar conductor 5A and the secondcolumnar conductor 5B, and as a result, the isolation of the duplexer can be improved. In addition, when the second columnar conductor drawnpart 6B and the fifth columnar conductor drawnpart 6E which output the reception signals as the balanced output are different in distance to the first columnar conductor drawnpart 6A electrically connected to theantenna terminal 4A, this configuration can improve the balance properties of the reception signals outputted from the columnar conductor drawnparts - In addition, a description will be made of a problem arising in a case where the duplexer has a function to output a balanced signal, that is, in a case where the
reception terminal 4B shown inFIG. 2 is a first balanced output terminal, the acoustic wave element has a second balanced output terminal (not shown) as a third terminal, and a fourth columnar conductor (not shown) having at least one part embedded in thesubstrate 5, electrically connected to the second balanced output terminal (not shown), and drawn to the back surface of thesubstrate 5 is provided. In the above case, since both of the second columnar conductor drawnpart 6B and the fourth columnar conductor drawn part (not shown) are exposed onto the back surface of thesubstrate 5 having a limited area, either one of the second columnar conductor drawnpart 6B and the fourth columnar conductor drawn part (not shown) is inevitably close to the first columnar conductor drawnpart 6A shown inFIG. 6 , so that there is concern that the isolation could be lowered. In this case, as shown inFIG. 4 in the above embodiment, the thirdcolumnar conductor 5C electrically connected to the secondground pattern region 8B through the firstground pattern region 8A can prevent the electromagnetic field coupling from generating between thefirst columnar conductor 5A and the secondcolumnar conductor 5B, and as a result, the isolation of the duplexer can be improved. - Furthermore, as described above, when the acoustic wave element has the first and second balanced output terminals (not shown), a desirable effect can be produced when the drawn parts (not shown) of them on the back surface of the
substrate 5 are arranged on the same one side in the back surface of thesubstrate 5 because a connection wiring with another component can be facilitated on a module substrate (not shown) mounting this duplexer. - In addition, as shown in
FIG. 10 , the first columnar conductor drawnpart 6A electrically connected to theantenna terminal 4A (refer toFIGS. 1 and 2 ) is arranged in the center of afirst side 10A. In addition, the drawnpart 6B of the secondcolumnar conductor 5B electrically connected to thereception terminal 4B (refer toFIGS. 1 and 2 ) is arranged on asecond side 10B roughly perpendicular to thefirst side 10A in thesubstrate 5. Furthermore, the drawnpart 6D of the fourth columnar conductor (not shown) electrically connected to thetransmission terminal 4C (refer toFIG. 1 ) is arranged on athird side 10D roughly perpendicular to thefirst side 10A in thesubstrate 5. In the above configuration, the electromagnetic field coupling can be prevented from generating between theantenna terminal 4A (refer toFIGS. 1 and 2 ) and thereception terminal 4B (refer toFIGS. 1 and 2 ), and between theantenna terminal 4A (refer toFIGS. 1 and 2 ) and thetransmission terminal 4C (refer toFIG. 1 ) and the isolation of the duplexer can be improved. - Furthermore, as shown in
FIG. 11 as a bottom view of theacoustic wave element 4, when the acoustic wave element includes a DMS (double-mode surface acoustic wave)filter 11, as shown inFIG. 12 , it is preferable that athird ground pattern 12 is formed in thesubstrate 5, and fifthcolumnar conductors 13A and 13B electrically connected tofourth ground patterns DMS filter 11 shown inFIG. 11 are electrically connected to thethird ground pattern 12. - In the above configuration, a parasitic component interposed between the
DMS filter 11 and the ground potential can be prevented from generating, and as a result, common mode properties can be improved as shown inFIG. 13 . - In addition, when two or more DMS filters are connected, as shown in
FIG. 11 , by connecting a fifth columnar conductor 13C electrically connected to a fourth ground pattern 14C formed between the two DMS filters, to thethird ground pattern 12, the above effect can be further improved. - A duplexer according to the present invention produces an effect that isolation can be improved, and can be useful in various electronic devices such as a mobile phone and the like.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/551,853 US8368486B2 (en) | 2007-10-01 | 2012-07-18 | Duplexer |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-257302 | 2007-10-01 | ||
JP2007257302 | 2007-10-01 | ||
JP2008113564 | 2008-04-24 | ||
JP2008-113564 | 2008-04-24 | ||
PCT/JP2008/002676 WO2009044516A1 (en) | 2007-10-01 | 2008-09-26 | Duplexer |
US68118210A | 2010-04-01 | 2010-04-01 | |
US13/551,853 US8368486B2 (en) | 2007-10-01 | 2012-07-18 | Duplexer |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/681,182 Division US8330553B2 (en) | 2007-10-01 | 2008-09-26 | Duplexer |
PCT/JP2008/002676 Division WO2009044516A1 (en) | 2007-10-01 | 2008-09-26 | Duplexer |
US68118210A Division | 2007-10-01 | 2010-04-01 |
Publications (2)
Publication Number | Publication Date |
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US20120326801A1 true US20120326801A1 (en) | 2012-12-27 |
US8368486B2 US8368486B2 (en) | 2013-02-05 |
Family
ID=40525948
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/681,182 Active 2029-07-17 US8330553B2 (en) | 2007-10-01 | 2008-09-26 | Duplexer |
US13/551,853 Active US8368486B2 (en) | 2007-10-01 | 2012-07-18 | Duplexer |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US12/681,182 Active 2029-07-17 US8330553B2 (en) | 2007-10-01 | 2008-09-26 | Duplexer |
Country Status (4)
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US (2) | US8330553B2 (en) |
JP (1) | JP5178729B2 (en) |
CN (1) | CN101809867B (en) |
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JP5178729B2 (en) * | 2007-10-01 | 2013-04-10 | パナソニック株式会社 | Duplexer |
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EP0961404B1 (en) | 1998-05-29 | 2008-07-02 | Fujitsu Limited | Surface-acoustic-wave filter having an improved suppression outside a pass-band |
JP3487414B2 (en) | 1998-05-29 | 2004-01-19 | 富士通株式会社 | Surface acoustic wave filter device |
JP4000960B2 (en) * | 2001-10-19 | 2007-10-31 | 株式会社村田製作所 | Duplexer, communication equipment |
JP3833569B2 (en) | 2001-12-21 | 2006-10-11 | 富士通メディアデバイス株式会社 | Demultiplexer and electronic device using the same |
DE60220143T2 (en) * | 2002-05-16 | 2008-01-31 | Tdk Corp. | antenna Combiner |
JP2004080233A (en) * | 2002-08-14 | 2004-03-11 | Murata Mfg Co Ltd | Branching filter |
US7298231B2 (en) * | 2004-05-27 | 2007-11-20 | Kyocera Corporation | Surface acoustic wave device and communication apparatus |
JP5073355B2 (en) | 2007-04-20 | 2012-11-14 | 太陽誘電株式会社 | Antenna duplexer |
JP5178729B2 (en) * | 2007-10-01 | 2013-04-10 | パナソニック株式会社 | Duplexer |
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2008
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- 2008-09-26 WO PCT/JP2008/002676 patent/WO2009044516A1/en active Application Filing
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US8368486B2 (en) | 2013-02-05 |
CN101809867A (en) | 2010-08-18 |
WO2009044516A1 (en) | 2009-04-09 |
JPWO2009044516A1 (en) | 2011-02-03 |
US8330553B2 (en) | 2012-12-11 |
JP5178729B2 (en) | 2013-04-10 |
US20100219901A1 (en) | 2010-09-02 |
CN101809867B (en) | 2013-05-29 |
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